find the slope of the line.

Explanation:

Step1: Recall slope - formula

The slope formula is $m=\frac{y_2 - y_1}{x_2 - x_1}$, where $(x_1,y_1)$ and $(x_2,y_2)$ are two points on the line.

Step2: Select two points on the line

Let's take two points on the given horizontal line, say $(0,0)$ and $(2,0)$.

Step3: Substitute into the formula

Substitute $x_1 = 0,y_1 = 0,x_2 = 2,y_2 = 0$ into $m=\frac{y_2 - y_1}{x_2 - x_1}$. We get $m=\frac{0 - 0}{2 - 0}=0$.

Answer:

0